Imiquimod

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Imiquimod
Imiquimod.svg
Systematic (IUPAC) name
3-(2-Methylpropyl)-3,5,8-triazatricyclo[7.4.0.02,6]trideca-1(9),2(6),4,7,10,12-hexaen-7-amine
Clinical data
Trade names Aldara originally. Many brands available.[1]
AHFS/Drugs.com monograph
MedlinePlus a698010
Licence data EMA:Link, US FDA:link
Pregnancy
category
  • AU: B1
  • US: C (Risk not ruled out)
Legal status
Routes of
administration		 Topical
Pharmacokinetic data
Biological half-life 30 hours (topical dose), 2 hours (subcutaneous dose)
Identifiers
CAS Number 99011-02-6
ATC code D06BB10 (WHO)
PubChem CID: 57469
IUPHAR/BPS 5003
DrugBank DB00724 YesY
ChemSpider 51809 YesY
UNII P1QW714R7M YesY
KEGG D02500 YesY
ChEBI CHEBI:36704 YesY
ChEMBL CHEMBL1282 YesY
Synonyms 1-isobutyl-1H-imidazo[4,5-c]quinolin-4-amine
Chemical data
Formula C14H16N4
Molecular mass 240.304 g/mol
  • n3c1ccccc1c2c(ncn2CC(C)C)c3N
  • InChI=1S/C14H16N4/c1-9(2)7-18-8-16-12-13(18)10-5-3-4-6-11(10)17-14(12)15/h3-6,8-9H,7H2,1-2H3,(H2,15,17) YesY
  • Key:DOUYETYNHWVLEO-UHFFFAOYSA-N YesY
  (verify)

Imiquimod (INN) is a prescription medication that acts as an immune response modifier and is used to treat genital warts, superficial basal cell carcinoma, and actinic keratosis. Scientists at 3M's pharmaceuticals division discovered the drug and 3M obtained the first FDA approval in 1997 under the brand Aldara. As of 2015 imiquimod is generic and is available worldwide under many brands.

Uses

Imiquimod is a patient-applied cream prescribed to treat genital warts and, secondary to surgery, for basal cell carcinoma,[2][3] as well as actinic keratosis.[4]

Side effects

Side effects include local inflammatory reactions like blisters, a burning sensation, skin redness, dry skin, itching, skin breakdown, skin crusting or scabbing, skin drainage, skin flaking or scaling, skin ulceration, sores, swelling, as well as systemic reactions like fever, "flu-like" symptoms, headache, and tiredness.[4][5]

People who have had an organ transplant and are taking immune-suppressing drugs should not use imiquimod.[4]

Mechanism of action

It is known that imiquimod signals to the innate arm of the immune system through the toll-like receptor 7 (TLR7), commonly involved in pathogen recognition.[6][7] Cells activated by imiquimod via TLR-7 secrete cytokines (primarily interferon-α (IFN-α), interleukin-6 (IL-6), and tumor necrosis factor-α (TNF-α)).[8] There is evidence that imiquimod, when applied to skin, can lead to the activation of Langerhans cells, which subsequently migrate to local lymph nodes to activate the adaptive immune system.[9] Other cell types activated by imiquimod include natural killer cells, macrophages and B-lymphocytes.[9] Overall imiquimod acts on several levels, which appear to synergistically underlie the profound antitumoral activity of the compound.[10]

History

Scientists at 3M's pharmaceutical division discovered imiquimod as part of a program to discover inhibitors of herpes virus replication based on a known adenine derivative.[11]:369–372 3M obtained the first FDA approval for it in 1997 as a treatment for external genital and perianal warts under the brand, "Aldara".[12] In 2004 3M obtained FDA approval to market imiquimod as a treatment for superficial basal cell carcinoma.[13]

In 2006, 3M sold its pharmaceutical business in the Americas to Graceway Pharmaceuticals, its European pharmaceutical business to Meda AB, and its pharmaceutical business in other territories to two private equity firms.[14]

Graceway declared bankruptcy in 2011 after the expiration of the patents on imiquimod, and its assets, including the rights to imiquimod branding and approvals in the Americas, were purchased by Medicis Pharmaceutical.[15]

As of 2015, imiquimod is generic and is available worldwide under many brands.[1]

Research

Imiquimod has been tested for treatment of molluscum contagiosum. Two large randomized controlled trials, however, found no evidence of effectiveness of imiquimod in treating children with molluscum contagiosum, and concerning adverse effects were also noted.[16]

Imiquimod has also been tested for treatment of vulvar intraepithelial neoplasia, common warts that have proven difficult to treat,[17] and vaginal intraepithelial neoplasia.[18]

See also

References

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External links

  1. ↑ 1.0 1.1 Drugs.com Drugs.com international listings for imiquimod Page accessed June 14, 2015
  2. ↑ 'Imiquimod should be used for treatment of [superficial basal cell carcinoma] only when surgery is medically less appropriate ... .' USA Food And Drug Administration, 'FDA Approval for Imiquimod', [1], current at 2011-Jan-1, accessed 2012-Oct-19
  3. ↑ American Cancer Society, Guide To Cancer Drugs, [2] (accessed 2014-Apr-28)
  4. ↑ 4.0 4.1 4.2 European Medicines Agency. First published Sept 14,2009, updated March 25, 2015. EMA Summary of Product Characteristics Linked from EMA Aldara information page
  5. ↑ PDR Health PDR: Aldara Page accessed June 14, 2015
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ 9.0 9.1 Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ Randall L. Halcomb. TLR-7 Agonists for the Treatment of Viral Hepatitis. Chapter 10 in Successful Strategies for the Discovery of Antiviral Drugs. Issue 32 of RSC drug discovery series. Eds Manoj C. Desai and Nicholas A. Meanwell. Royal Society of Chemistry, 2013. ISBN 9781849736572
  12. ↑ Centerwatch. Centerwatch:Aldara (imiquimod) Page accessed June 14, 2015
  13. ↑ National Cancer Institute. Updated: July 3, 2013 NCI: FDA Approval for Imiquimod
  14. ↑ 3M. November 9, 2006. Press release: 3M Reaches Agreements to Sell its Pharmaceuticals Business
  15. ↑ Jennifer A. Johnson for the Phoenix Business Journal Nov 29, 2011
  16. ↑ Aldara (imiquimod) cream for topical use. Prescribing information. http://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=7fccca4e-fb8f-42b8-9555-8f78a5804ed3
  17. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  18. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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